Action fails with the most recent version of kubescape

Looks like the `kubescape --version` flag was replaced with `kubescape version` in recent releases.

The action failed with kubescape version 2.3.4 with the following:
```
+ kubescape --version
Error: unknown flag: --version
```

Pinning the kubescape version to the one shown in the doc - v2.0.155 - fixes the issue.